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<H1>IBM Visualization Data Explorer Programmer&#39;s Reference</H1>
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<H3><A NAME="HDRDXT"></A><A HREF="progu097.htm#PToC_429">DXTrim</A></H3>
<A NAME="IDX2129"></A>
<A NAME="IDX2130"></A>
<P><STRONG>Function</STRONG>
<P>
Frees space allocated in an Array beyond that required for the number
of items in the Array.

		<P><STRONG>Syntax</STRONG></P>
		<P><TT><STRONG>
					#include &lt;dx/dx.h&gt;</STRONG></TT></P>
		<P><TT><STRONG>Array DXTrim(Array a)</STRONG></TT></P>
		<P><STRONG>Functional Details</STRONG>
		<P>
Under
some circumstances, more space than is necessary to hold the
items added to
<TT><STRONG>
a
</STRONG></TT>
may have been allocated.  This can happen if
you have called
<TT><STRONG>DXAllocateArray</STRONG></TT>.  It can also happen when you
call
<TT><STRONG>DXAddArrayData</STRONG></TT>.  This
extra space can be freed by calling
<TT><STRONG>DXTrim</STRONG></TT>.  The
<TT><STRONG>
DXEndField
</STRONG></TT>
routine automatically calls
<TT><STRONG>
DXTrim
</STRONG></TT>
on all components of a Field.
<P><STRONG>Return Value</STRONG>
		<P>
Returns <TT><STRONG>a</STRONG></TT> or returns <TT><STRONG>NULL</STRONG></TT>
and
sets an error code.

		<H3><A NAME="HDRDTI"></a><A HREF="progu097.htm#PToC_429">DXTrimItems</A></H3>
		<P><STRONG>Function</STRONG></P>
		<P>Frees space allocated in an Array beyond that required for the number of items in the Array.</P>
		<P><STRONG>Syntax</STRONG></P>
		<P><TT><STRONG>#include &lt;dx/dx.h&gt;</STRONG></TT></P>
		<P><TT><STRONG>Array DXTrimItems(Array a, int nitems)</STRONG></TT></P>
		<P><STRONG>Functional Details</STRONG></P>
		<P>It may desirable to remove elements at the end of an array to shrink the array without having to copy it. 
		<TT><STRONG>DXTrimItems</TT></STRONG>  will make the array nitems long removing items 
		from the end of the array and  automatically calling <TT><STRONG>DXTrim</STRONG></TT> to free the extra array memory.</P>
		<P><STRONG>Return Value</STRONG></P>
		<P>Returns <TT><STRONG>a</STRONG></TT> or returns <TT><STRONG>NULL</STRONG></TT> and sets an error code. </P>
		<P><STRONG>See Also</STRONG></P>
		<P>
<TT><STRONG>
<A HREF="progu100.htm#HDRDXAAD">DXAddArrayData</A>,
<A HREF="progu107.htm#HDRDXAA">DXAllocateArray</A>,
<A HREF="progu136.htm#HDRDXENDF">DXEndField</A>, </STRONG></TT><A HREF="progu046.htm#HDRIRREG">"Irregular Arrays"</A>.

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